Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 25: Focussed Session: Strong Light Matter Coupling II
HL 25.3: Talk
Tuesday, March 23, 2010, 14:45–15:00, H13
Electrically-driven AlGaAs/AlAs Quantum Well-Microcavities for Exciton-Polariton Studies — •Arash Rahimi-Iman1, Matthias Lermer1, Christian Schneider1, Sven Hoefling1, Stephan Reitzenstein1, Lukas Worschech1, Alfred Forchel1, Na Young Kim2, and Yoshihisa Yamamoto2 — 1Technische Physik, Universität Würzburg, D-97074 Wuerzburg, Germany — 2Ginzton Laboratory, Stanford University, Stanford, CA-94305, USA
In a semiconductor microcavity with embedded quantum wells (QWs) new eigenmodes are formed called the polaritons when the confined cavity photon modes strongly couple to the QW excitons. Cavity polaritons and their ability to undergo Bose-Einstein condensation have been intensively studied in the last decade, mainly in the optical pumping regime. Very recently, also electrically driven polariton systems for further studies and future applications have been brought into focus.
Doped microcavity structures with p-i-n-diode type design have proven as appropriate systems for current injection into the active region of the cavity. We have realized and studied electrically contacted AlGaAs/AlAs microcavities containing 4 GaAs QWs in a λ/2 AlAs cavity sandwiched between an n-doped lower and an p-doped upper distributed Bragg reflector. For the planar sample structure, we observed strong coupling associated with a Rabi-splitting of ≈10 meV in photo- as well as electroluminescence. We report on angularly resolved studies on polariton emission under both optical and electrical excitation. The respective data will be compared with results obtained from polariton LEDs based on InGaAs QWs.